CA2872360C - Method for preparing inhibition slurry containing pulverized fuel ash for controlling fire in coal fields - Google Patents
Method for preparing inhibition slurry containing pulverized fuel ash for controlling fire in coal fields Download PDFInfo
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- CA2872360C CA2872360C CA2872360A CA2872360A CA2872360C CA 2872360 C CA2872360 C CA 2872360C CA 2872360 A CA2872360 A CA 2872360A CA 2872360 A CA2872360 A CA 2872360A CA 2872360 C CA2872360 C CA 2872360C
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- coal
- pulverized fuel
- fuel ash
- slurry
- inhibition
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- 239000003245 coal Substances 0.000 title claims abstract description 59
- 239000002002 slurry Substances 0.000 title claims abstract description 33
- 239000000446 fuel Substances 0.000 title claims abstract description 29
- 230000005764 inhibitory process Effects 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims abstract description 22
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 11
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 11
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims abstract description 11
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 claims abstract description 11
- 239000000440 bentonite Substances 0.000 claims abstract description 11
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 11
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 11
- 229910001629 magnesium chloride Inorganic materials 0.000 claims abstract description 11
- 239000011734 sodium Substances 0.000 claims abstract description 11
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 11
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims abstract description 11
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims abstract description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims description 18
- 239000000243 solution Substances 0.000 claims description 17
- 239000011259 mixed solution Substances 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 239000007787 solid Substances 0.000 abstract description 2
- 230000002269 spontaneous effect Effects 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 230000008020 evaporation Effects 0.000 abstract 1
- 238000001704 evaporation Methods 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000005422 blasting Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000034994 death Effects 0.000 description 2
- 231100000517 death Toxicity 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/02—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires by wetting or spraying
- E21F5/06—Fluids used for spraying
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/08—Rock dusting of mines; Depositing other protective substances
- E21F5/12—Composition of rock dust
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
- A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
- A62D1/0028—Liquid extinguishing substances
- A62D1/005—Dispersions; Emulsions
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Business, Economics & Management (AREA)
- General Chemical & Material Sciences (AREA)
- Emergency Management (AREA)
- Inorganic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Fireproofing Substances (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The present invention provides a method for preparing inhibition slurry containing pulverized fuel ash for controlling fire in coal fields, comprising the step of adding pulverized fuel ash, aluminum phosphate, magnesium chloride, sodium carboxymethylcellulose, sodium silicate and sodium-based bentonite material in water to prepare high-inhibition and high-temperature resistant pulverized fuel ash thickened slurry. The prepared thickened slurry is conveyed by means of a high-pressure screw pump through a grouting pipeline to a burning coal seam or into the fractures of coal body. After a period of time, the inhibition slurry can be thickened and solidified into a soft solid form. The inhibition slurry is resistant to high temperature up to 1000°C or above, can form a hard blocky structure after evaporation of water, and can tightly cover the coal and seal the fractures. The pulverized fuel ash containing inhibition slurry is low in cost, safe and environment-friendly, attains an outstanding effect of fire control against spontaneous coal combustion in coal fields, and has good application prospects.
Description
Method for Preparing Inhibition Slurry Containing Pulverized Fuel Ash for Controlling Fire in Coal Fields Field of the Invention The present invention relates to a method for controlling fire in coal fields, in particular to a method for preparing inhibition slurry containing pulverized fuel ash for controlling fire incurred by coal spontaneous ignition in coal fields.
Background of the Invention Coal is a major energy resource in China, and accounts for about 70% in the primary energy production and consumption structure. Viewed from spatial distribution, coal resources in China are mainly distributed in Northwest region and North region of China, wherein, the proved coal reserves in Xingi iang, Inner Mongolia, Shanxi, Shaanxi, Ningxia and Gansu account for about 80%
of the total coal reserves in China, and these provinces and regions are strategic bases of energy resources for energy safety and economic development in China. As the geographical distribution of the coal industry is shifted westwards further, the strategic role of these provinces and regions is increasingly prominent. However, in these provinces and regions, especially in Xinjiang, Inner Mongolia, and Ningxia, fire disasters happen frequently, owing to the dry climate, thick coal seam and shallow occurrence, along with unauthorized and wasteful mining. In Xinjiang, fire disasters have happened in 44 coal fields up to now, with total burning area as large as 9.92 million m2; the annual loss of burnt coal is as high as 5.52 million tons per year, 47.7 billion tons of reserves is threatened by the burning areas, and the greenhouse gas CO2 emitted is as high as 12.38 million tons per year. In addition, there is 19.03 million m2 total burning area in major coal fields in Wuda, Table Mountain, Erdos, Junggar, and Gulaben of Inner Mongolia, wherein, the total burning area in Wuda coal field in year 2009 was as large as 4.754 million m2, increased by 40% since 2004.The total burning area in coal fields in Ningxia is 3.9456 million m2, the direct loss of burnt coal is almost 1 million tons per year, and the dull coal reserves beneath the burning areas is 78.7258 million tons. Fire disasters in coal fields not only burns non-renewable coal resource directly but also indirectly results in dull coal resource in a quantity equivalent to tens of times of the burnt coal resource, which can't be exploited; furthermore, fires directly threaten the safety of production in coal mines, cause soil desertification, vegetation death, surface collapse, gushing of steams, fumes, and hot waves, wide-spread crystallized sulfur, coal tar, and hot fire holes, and emission of a great deal of toxic and harmful gasses (e.g., CO, CO2, and SO2) into the air, severely impair local ecological environment and underground water resources, and even endanger the survival of residents in some places. The coal fire problem has become a severe problem that endangers the safety of the energy resource strategy and hampers ecological harmonious development in China, and has drawn attentions of relevant experts in many countries in the world.
At present, the methods for controlling fires in coal fields all over the world mainly include stripping method, water injection method, and slurry injection method. The stripping method is poor in safety and involves heavy workload. The burning in the burning area causes many hollow areas and subsidence areas, thus the dozer or excavator used in the stripping operation may be
Background of the Invention Coal is a major energy resource in China, and accounts for about 70% in the primary energy production and consumption structure. Viewed from spatial distribution, coal resources in China are mainly distributed in Northwest region and North region of China, wherein, the proved coal reserves in Xingi iang, Inner Mongolia, Shanxi, Shaanxi, Ningxia and Gansu account for about 80%
of the total coal reserves in China, and these provinces and regions are strategic bases of energy resources for energy safety and economic development in China. As the geographical distribution of the coal industry is shifted westwards further, the strategic role of these provinces and regions is increasingly prominent. However, in these provinces and regions, especially in Xinjiang, Inner Mongolia, and Ningxia, fire disasters happen frequently, owing to the dry climate, thick coal seam and shallow occurrence, along with unauthorized and wasteful mining. In Xinjiang, fire disasters have happened in 44 coal fields up to now, with total burning area as large as 9.92 million m2; the annual loss of burnt coal is as high as 5.52 million tons per year, 47.7 billion tons of reserves is threatened by the burning areas, and the greenhouse gas CO2 emitted is as high as 12.38 million tons per year. In addition, there is 19.03 million m2 total burning area in major coal fields in Wuda, Table Mountain, Erdos, Junggar, and Gulaben of Inner Mongolia, wherein, the total burning area in Wuda coal field in year 2009 was as large as 4.754 million m2, increased by 40% since 2004.The total burning area in coal fields in Ningxia is 3.9456 million m2, the direct loss of burnt coal is almost 1 million tons per year, and the dull coal reserves beneath the burning areas is 78.7258 million tons. Fire disasters in coal fields not only burns non-renewable coal resource directly but also indirectly results in dull coal resource in a quantity equivalent to tens of times of the burnt coal resource, which can't be exploited; furthermore, fires directly threaten the safety of production in coal mines, cause soil desertification, vegetation death, surface collapse, gushing of steams, fumes, and hot waves, wide-spread crystallized sulfur, coal tar, and hot fire holes, and emission of a great deal of toxic and harmful gasses (e.g., CO, CO2, and SO2) into the air, severely impair local ecological environment and underground water resources, and even endanger the survival of residents in some places. The coal fire problem has become a severe problem that endangers the safety of the energy resource strategy and hampers ecological harmonious development in China, and has drawn attentions of relevant experts in many countries in the world.
At present, the methods for controlling fires in coal fields all over the world mainly include stripping method, water injection method, and slurry injection method. The stripping method is poor in safety and involves heavy workload. The burning in the burning area causes many hollow areas and subsidence areas, thus the dozer or excavator used in the stripping operation may be
2 trapped, resulting in personal injuries and severe economic loss; furthermore, if the condition of underground coal fire is not ascertained, the coal fire may obtain oxygen after the stripping operation and thereby spread quickly; consequently, the burning area may be increased, and the fire will be more dangerous and difficult to suppress. The method is difficult to implement when it is used for directly stripping coal fire in high burial depth, and involves high workload and high cost; when the burning area is to be stripped by blasting, usually the blasting temperature should be no higher than 40-60 C ;,however, 100 C or higher temperature is often encountered in the blast holes in a burning area. Therefore, blasting can't be executed successfully in a burning area.
Presently, water or slurry injection, together with soil covering, is the most commonly used method for controlling coal fire. Since water and soil are two extinguish materials that are widely available and cheap, water/slurry injection is the most economic fire suppression method; however, water and slurry may flow downwards along the fractures of coal rocks or the tunnels of old pits, it can't cover the burning area uniformly and effectively. Many boreholes should be drilled out and a lot of fish scale pits should be worked out, and a large quantity of water should be injected for a long period, in order to cool down the coal body gradually, statistics show that 80% or more water runs off in vain, without any heat absorption and cooling effect, since the flow channels of water/slurry are insufficient. During the water/slurry injection process, water gas explosion may occur and causes personal injuries and deaths, when water is accumulated at a hot fire spot; in addition, if the mine is in production beneath the coal fire, a slurry burst accident may occur easily during slurry injection, endangering the safe production in the underground area. Therefore, the conventional water/slurry inspection method can't fully meet the demand for coal fire suppression and control.
Summary of the Invention Technical problem: In view of the drawbacks in the prior art, the object of the present invention is to provide a method for preparing inhibition slurry containing pulverized fuel ash for controlling fire in coal fields, which is simple, has high inhibition performance, and is high-temperature resistant, dehydration resistant, and low in price.
Technical scheme: The method for preparing inhibition slurry containing pulverized fuel ash for controlling fire in coal fields according to the present invention employs pulverized fuel ash, aluminum phosphate, magnesium chloride, sodium carboxymethylcellulose, sodium silicate, sodium-based bentonite, and water as the raw materials, and comprises the following steps:
a. adding 25-30 wt% of pulverized fuel ash, 2-4 wt% of aluminum phosphate, 2-5 wt% of magnesium chloride, and 0.84.5 wt% of sodium carboxymethylcellulose in water, and stirring intensively to prepare a mixed solution A;
b adding 3-5 wt% of sodium silicate and 1-2 wt% of sodium-based bentonite in water, and stirring intensively to prepare a mixed solution B;
c. adding the solution B into the solution A while stirring completely to a homogeneous state, the mass ratio of solution B and solution A is 1:2,.
Beneficial effects: in the method for preparing inhibition slurry containing pulverized fuel ash for controlling fire in coal fields according to the present invention, pulverized fuel ash, aluminum phosphate, magnesium chloride, sodium carboxymethylcellulose, sodium silicate, and
Presently, water or slurry injection, together with soil covering, is the most commonly used method for controlling coal fire. Since water and soil are two extinguish materials that are widely available and cheap, water/slurry injection is the most economic fire suppression method; however, water and slurry may flow downwards along the fractures of coal rocks or the tunnels of old pits, it can't cover the burning area uniformly and effectively. Many boreholes should be drilled out and a lot of fish scale pits should be worked out, and a large quantity of water should be injected for a long period, in order to cool down the coal body gradually, statistics show that 80% or more water runs off in vain, without any heat absorption and cooling effect, since the flow channels of water/slurry are insufficient. During the water/slurry injection process, water gas explosion may occur and causes personal injuries and deaths, when water is accumulated at a hot fire spot; in addition, if the mine is in production beneath the coal fire, a slurry burst accident may occur easily during slurry injection, endangering the safe production in the underground area. Therefore, the conventional water/slurry inspection method can't fully meet the demand for coal fire suppression and control.
Summary of the Invention Technical problem: In view of the drawbacks in the prior art, the object of the present invention is to provide a method for preparing inhibition slurry containing pulverized fuel ash for controlling fire in coal fields, which is simple, has high inhibition performance, and is high-temperature resistant, dehydration resistant, and low in price.
Technical scheme: The method for preparing inhibition slurry containing pulverized fuel ash for controlling fire in coal fields according to the present invention employs pulverized fuel ash, aluminum phosphate, magnesium chloride, sodium carboxymethylcellulose, sodium silicate, sodium-based bentonite, and water as the raw materials, and comprises the following steps:
a. adding 25-30 wt% of pulverized fuel ash, 2-4 wt% of aluminum phosphate, 2-5 wt% of magnesium chloride, and 0.84.5 wt% of sodium carboxymethylcellulose in water, and stirring intensively to prepare a mixed solution A;
b adding 3-5 wt% of sodium silicate and 1-2 wt% of sodium-based bentonite in water, and stirring intensively to prepare a mixed solution B;
c. adding the solution B into the solution A while stirring completely to a homogeneous state, the mass ratio of solution B and solution A is 1:2,.
Beneficial effects: in the method for preparing inhibition slurry containing pulverized fuel ash for controlling fire in coal fields according to the present invention, pulverized fuel ash, aluminum phosphate, magnesium chloride, sodium carboxymethylcellulose, sodium silicate, and
3 sodium-based bentonite, etc. are added into water, and stirred completely, to prepare thickened slurry containing pulverized fuel ash, which has high inhibition performance and is high-temperature resistant. The prepared thickened slurry is conveyed by means of a high-pressure screw pump through a grouting pipeline to a burning coal seam or into the factures of coal body.
The material has high heat absorption and cooling performance, and is resistant to high temperature up to 1000 C or above. Therefore, the material can be used to efficiently suppress fire and cooling the burning area in a coal field; in addition, the material has high inhibition performance and can effectively make the surface active structures of coal body inerting.
Compared with the prior art, the inhibition performance of the inhibition material is 3-5 times higher. In addition, after the inhibition slurry containing pulverized fuel ash covers the coal seam or is accumulated in the fractures of coal body for a while, it will turn into thickened soft solid, which can tightly cover the coal body and seal the factures in the coal body, thereby isolate the coal from oxygen, and effectively prevent oxygen supply into the burning area.
The inhibition slurry in the present invention is cheap, safe, and environment friendly, attains an outstanding fire control effect for coal fields, and has good application prospects.
Detailed Description of the Embodiments The method for preparing inhibition slurry containing pulverized fuel ash for controlling fire in coal fields according to the present invention employs pulverized fuel ash, aluminum phosphate, magnesium chloride, sodium carboxymethylcellulose, sodium silicate, sodium-based bentonite, and water as the raw materials, and comprises the following steps:
a. adding 25 ¨30 wt% of pulverized fuel ash, 2-4 wt% of aluminum phosphate, 2 ¨5 wt% of magnesium chloride, and 0.8 ¨1.5 wt% of sodium carboxymethylcellulose in water, and stirring intensively to prepare a mixed solution A;
b. adding 3-5 wt% of sodium silicate and 1-2 wt% of sodium-based bentonite in water, and stirring intensively to prepare a mixed solution B;
c. adding the solution B into the solution A while stirring completely for about 5min., then the inhibition slurry containing pulverized fuel ash is formed, the mass ratio of solution B and solution A is 1:2.
If a higher thickening speed is expected, the percentages by weight of the two materials in the solution B can select the indicated higher values; if a lower thickening speed is expected, the percentages by weight of the two materials in the solution B can select the indicated lower values.
Embodiment Embodiment 1: first, add 250kg of pulverized fuel ash, 20kg of aluminum phosphate, 20kg of magnesium chloride, and 8kg of sodium carboxymethylcellulose into 1000kg of water, and stir completely to a homogeneous state, so as to prepare a mixed solution at 23%
concentration; then, add 15kg of sodium silicate and 5kg of sodium-based bentonite into 500kg of water, and stir completely to a homogeneous state, to prepare a mixed solution at 3.8%
concentration; mix the two solutions, and stir completely to a homogeneous state for 5min., thus a new inhibition slurry containing pulverized fuel ash is formed.
Embodiment 2: first, add 300kg of pulverized fuel ash, 40kg of aluminum phosphate, 50kg of
The material has high heat absorption and cooling performance, and is resistant to high temperature up to 1000 C or above. Therefore, the material can be used to efficiently suppress fire and cooling the burning area in a coal field; in addition, the material has high inhibition performance and can effectively make the surface active structures of coal body inerting.
Compared with the prior art, the inhibition performance of the inhibition material is 3-5 times higher. In addition, after the inhibition slurry containing pulverized fuel ash covers the coal seam or is accumulated in the fractures of coal body for a while, it will turn into thickened soft solid, which can tightly cover the coal body and seal the factures in the coal body, thereby isolate the coal from oxygen, and effectively prevent oxygen supply into the burning area.
The inhibition slurry in the present invention is cheap, safe, and environment friendly, attains an outstanding fire control effect for coal fields, and has good application prospects.
Detailed Description of the Embodiments The method for preparing inhibition slurry containing pulverized fuel ash for controlling fire in coal fields according to the present invention employs pulverized fuel ash, aluminum phosphate, magnesium chloride, sodium carboxymethylcellulose, sodium silicate, sodium-based bentonite, and water as the raw materials, and comprises the following steps:
a. adding 25 ¨30 wt% of pulverized fuel ash, 2-4 wt% of aluminum phosphate, 2 ¨5 wt% of magnesium chloride, and 0.8 ¨1.5 wt% of sodium carboxymethylcellulose in water, and stirring intensively to prepare a mixed solution A;
b. adding 3-5 wt% of sodium silicate and 1-2 wt% of sodium-based bentonite in water, and stirring intensively to prepare a mixed solution B;
c. adding the solution B into the solution A while stirring completely for about 5min., then the inhibition slurry containing pulverized fuel ash is formed, the mass ratio of solution B and solution A is 1:2.
If a higher thickening speed is expected, the percentages by weight of the two materials in the solution B can select the indicated higher values; if a lower thickening speed is expected, the percentages by weight of the two materials in the solution B can select the indicated lower values.
Embodiment Embodiment 1: first, add 250kg of pulverized fuel ash, 20kg of aluminum phosphate, 20kg of magnesium chloride, and 8kg of sodium carboxymethylcellulose into 1000kg of water, and stir completely to a homogeneous state, so as to prepare a mixed solution at 23%
concentration; then, add 15kg of sodium silicate and 5kg of sodium-based bentonite into 500kg of water, and stir completely to a homogeneous state, to prepare a mixed solution at 3.8%
concentration; mix the two solutions, and stir completely to a homogeneous state for 5min., thus a new inhibition slurry containing pulverized fuel ash is formed.
Embodiment 2: first, add 300kg of pulverized fuel ash, 40kg of aluminum phosphate, 50kg of
4 magnesium chloride, and 15kg of sodium carboxymethylcellulose into 1000kg of water, and stir completely to a homogeneous state, so as to prepare a mixed solution at 28.8%
concentration; then, add 25kg of sodium silicate and 10kg of sodium-based bentonite into 500kg of water, and stir completely to a homogeneous state, to prepare a mixed solution at 6.5%
concentration; mix the two solutions, and stir intensively to a homogeneous state for 5min., thus a new inhibition slurry containing pulverized fuel ash is formed.
Embodiment 3: first, add 270kg of pulverized fuel ash, 30kg of aluminum phosphate, 30kg of magnesium chloride, and 10kg of sodium carboxymethylcellulose into 1000kg of water, and stir completely to a homogeneous state, so as to prepare a mixed solution at 25.4%
concentration; then, add 20kg of sodium silicate and 10kg of sodium-based bentonite into 500kg of water, and stir completely to a homogeneous state, to prepare a mixed solution at 5.7%
concentration; mix the two solutions, and stir intensively to a homogeneous state for 5min., thus a new inhibition slurry containing pulverized fuel ash is formed.
Convey the inhibition slurry containing pulverized fuel ash prepared as described above by means of a screw pump through a grouting pipeline to a burning coal dump, the temperature of the burning coal dump may be as high as 500 C or above; the inhibition slurry will uniformly cover the coal dump rapidly, therefore, the fire is suppressed quickly, and the temperature of the coal dump drops rapidly to normal temperature in a very short period. The fire suppression and cooling effect is outstanding for hot coal body that burns spontaneously.
concentration; then, add 25kg of sodium silicate and 10kg of sodium-based bentonite into 500kg of water, and stir completely to a homogeneous state, to prepare a mixed solution at 6.5%
concentration; mix the two solutions, and stir intensively to a homogeneous state for 5min., thus a new inhibition slurry containing pulverized fuel ash is formed.
Embodiment 3: first, add 270kg of pulverized fuel ash, 30kg of aluminum phosphate, 30kg of magnesium chloride, and 10kg of sodium carboxymethylcellulose into 1000kg of water, and stir completely to a homogeneous state, so as to prepare a mixed solution at 25.4%
concentration; then, add 20kg of sodium silicate and 10kg of sodium-based bentonite into 500kg of water, and stir completely to a homogeneous state, to prepare a mixed solution at 5.7%
concentration; mix the two solutions, and stir intensively to a homogeneous state for 5min., thus a new inhibition slurry containing pulverized fuel ash is formed.
Convey the inhibition slurry containing pulverized fuel ash prepared as described above by means of a screw pump through a grouting pipeline to a burning coal dump, the temperature of the burning coal dump may be as high as 500 C or above; the inhibition slurry will uniformly cover the coal dump rapidly, therefore, the fire is suppressed quickly, and the temperature of the coal dump drops rapidly to normal temperature in a very short period. The fire suppression and cooling effect is outstanding for hot coal body that burns spontaneously.
Claims (2)
1. A method for preparing inhibition slurry containing pulverized fuel ash for controlling fire in coal fields, wherein, employing pulverized fuel ash, aluminum phosphate, magnesium chloride, sodium carboxymethylcellulose, sodium silicate, sodium-based bentonite, and water being selected as the raw materials, and comprising:
a. adding 25~30 wt% of pulverized fuel ash, 2~4 wt% of aluminum phosphate,
a. adding 25~30 wt% of pulverized fuel ash, 2~4 wt% of aluminum phosphate,
2~5 wt%
of magnesium chloride, and 0.8~1.5 wt% of sodium carboxymethylcellulose in water, and stirring completely to prepare a mixed solution A;
b. adding 3~5 wt% of sodium silicate and 1~2 wt% of sodium-based bentonite in water, and stirring completely to prepare a mixed solution B;
c. adding the solution B into the solution A while stirring completely to a homogeneous state, the mass ratio of solution B and solution A is 1:2.
of magnesium chloride, and 0.8~1.5 wt% of sodium carboxymethylcellulose in water, and stirring completely to prepare a mixed solution A;
b. adding 3~5 wt% of sodium silicate and 1~2 wt% of sodium-based bentonite in water, and stirring completely to prepare a mixed solution B;
c. adding the solution B into the solution A while stirring completely to a homogeneous state, the mass ratio of solution B and solution A is 1:2.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310299434.1 | 2013-07-17 | ||
| CN201310299434.1A CN103362536B (en) | 2013-07-17 | 2013-07-17 | Preparation method of pulverized fuel ash containing inhibition slurry for controlling fire in coal field |
| PCT/CN2014/074072 WO2015007103A1 (en) | 2013-07-17 | 2014-03-26 | Method for preparing retardant slurry containing coal ash for controlling fire disaster in coal field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2872360A1 CA2872360A1 (en) | 2015-01-17 |
| CA2872360C true CA2872360C (en) | 2016-11-22 |
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| CA2872360A Expired - Fee Related CA2872360C (en) | 2013-07-17 | 2014-03-26 | Method for preparing inhibition slurry containing pulverized fuel ash for controlling fire in coal fields |
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| Country | Link |
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| CN (1) | CN103362536B (en) |
| AU (1) | AU2014274500B2 (en) |
| CA (1) | CA2872360C (en) |
| RU (1) | RU2584186C1 (en) |
| WO (1) | WO2015007103A1 (en) |
| ZA (1) | ZA201408006B (en) |
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| CN103362536B (en) * | 2013-07-17 | 2015-06-24 | 中国矿业大学 | Preparation method of pulverized fuel ash containing inhibition slurry for controlling fire in coal field |
| CN104225857A (en) * | 2014-08-26 | 2014-12-24 | 王会智 | Fire-extinguishing spray |
| CN104987856B (en) * | 2015-07-31 | 2018-07-13 | 山东盛海科贸有限公司 | Offshore drilling fluid pressurization sealing agent and its application process |
| CN106512276A (en) * | 2016-10-19 | 2017-03-22 | 安徽佳泰矿业科技有限公司 | Coal ash laminating type fire preventing and extinguishing agent and using method thereof |
| CN106761897B (en) * | 2016-12-02 | 2018-08-07 | 中国矿业大学 | A kind of phase-change material temperature-control afterbirth retardant preparation system and its method |
| CN106869988B (en) * | 2016-12-25 | 2019-03-26 | 广州发展燃料港口有限公司 | A kind of preparation method preventing spontaneous combustionof coal retardant |
| CN113209539B (en) * | 2021-05-17 | 2022-02-01 | 重庆工程职业技术学院 | Coal mine composite colloid fire prevention and extinguishing material and preparation method thereof |
| CN113339043B (en) * | 2021-07-05 | 2022-04-08 | 山东科技大学 | Uniform water injection disaster prevention method for high-impact-tendency coal seam |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1414044A (en) * | 1973-03-09 | 1975-11-12 | Tac Construction Materials Ltd | Insulation materials |
| SU1245714A1 (en) * | 1977-11-25 | 1986-07-23 | Всесоюзный Научно-Исследовательский Институт Горноспасательного Дела Восточное Отделение | Method of preventing explosion of gas-air mixture |
| SU1009455A1 (en) * | 1981-05-26 | 1983-04-07 | Восточный научно-исследовательский институт по безопасности работ в горной промышленности | Composition for extinguishing and preventing endogenic fires in worked area |
| SU1296730A1 (en) * | 1985-09-17 | 1987-03-15 | Московский химико-технологический институт им.Д.И.Менделеева | Composition for extinguishing and preventing fires |
| SU1620655A1 (en) * | 1989-02-28 | 1991-01-15 | Карагандинское отделение Восточного научно-исследовательского института по безопасности работ в горной промышленности | Gel-forming composition for preventing endogenic fires |
| DE4314704C1 (en) * | 1993-05-04 | 1994-09-22 | Kalk Chemische Fabrik Gmbh | Method of preventive fire protection in bituminous coal mining |
| JPH09100153A (en) * | 1995-10-02 | 1997-04-15 | Akira Kojima | Ceramic raw material composition, ceramic molding molded of the composition and production of the molding |
| US5907119A (en) * | 1997-07-24 | 1999-05-25 | Dyno Nobel Inc. | Method of preventing afterblast sulfide dust explosions |
| CN1915460A (en) * | 2005-08-19 | 2007-02-21 | 上海大屯能源股份有限公司 | Fireproofing extinguishing materials of composite colloid of fly ash for fire in coal bed |
| CN1887381A (en) * | 2006-07-13 | 2007-01-03 | 复旦大学 | Fire extinguishing coagulant-thickener of caustic sludge colloid |
| CN101713296B (en) * | 2009-12-03 | 2011-04-13 | 陕西省府谷县京府八尺沟煤矿 | Composite gel inhibitor for preventing and controlling spontaneous combustion of coal in coal mine and preparation method thereof |
| CN101723641A (en) * | 2009-12-15 | 2010-06-09 | 中国矿业大学 | Fire-prevention and leaking-stoppage thickened pulverized fuel ash slurry of goaf and preparation method thereof |
| CN101767975B (en) * | 2010-01-29 | 2011-12-21 | 北京工业大学 | Composite gel fire control material for treating coal seam fire |
| CN101793160B (en) * | 2010-01-29 | 2011-10-05 | 北京工业大学 | Environment-friendly flame-retardant high-molecular gel inhibitor for preventing coal from spontaneously combusting of coal mine |
| CN101993574B (en) * | 2010-10-11 | 2012-03-28 | 陈孟伯 | Fireproof high-molecular compound colloid material for coal mines |
| CN102258836B (en) * | 2011-05-11 | 2012-11-14 | 浙江威龙高分子材料有限公司 | Flame-retarding fire extinguishing agent for coal mines |
| CN102392674B (en) * | 2011-08-29 | 2014-01-01 | 北京工业大学 | Compounded latex retardant for preventing coal spontaneous combustion and preparation method thereof |
| CN102603220B (en) * | 2012-04-01 | 2013-12-18 | 昌吉市先导工程材料有限责任公司 | Preparation of polymer composite gelling agent for grouting and application method thereof |
| CN103013043B (en) * | 2012-11-15 | 2015-03-18 | 陕西理工学院 | Heat-insulating flame-retarding pulverized fuel ash decorative plate and production method thereof |
| CN102966369B (en) * | 2012-12-10 | 2014-09-03 | 中国矿业大学 | Composite stopping agent preventing coal spontaneous combustion based on low-temperature oxidation mechanism of coal |
| CN103232217A (en) * | 2013-05-06 | 2013-08-07 | 中国矿业大学(北京) | Mine loess composite gel fire preventing and extinguishing material and preparation method of material |
| CN103362536B (en) * | 2013-07-17 | 2015-06-24 | 中国矿业大学 | Preparation method of pulverized fuel ash containing inhibition slurry for controlling fire in coal field |
-
2013
- 2013-07-17 CN CN201310299434.1A patent/CN103362536B/en not_active Expired - Fee Related
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2014
- 2014-03-26 RU RU2014147113/03A patent/RU2584186C1/en not_active IP Right Cessation
- 2014-03-26 WO PCT/CN2014/074072 patent/WO2015007103A1/en active Application Filing
- 2014-03-26 CA CA2872360A patent/CA2872360C/en not_active Expired - Fee Related
- 2014-03-26 AU AU2014274500A patent/AU2014274500B2/en not_active Ceased
- 2014-11-03 ZA ZA2014/08006A patent/ZA201408006B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CA2872360A1 (en) | 2015-01-17 |
| AU2014274500B2 (en) | 2016-01-28 |
| CN103362536B (en) | 2015-06-24 |
| WO2015007103A1 (en) | 2015-01-22 |
| AU2014274500A1 (en) | 2015-02-05 |
| RU2584186C1 (en) | 2016-05-20 |
| CN103362536A (en) | 2013-10-23 |
| ZA201408006B (en) | 2017-01-25 |
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